I've worked with raw reuters feed, pre-voice over editing. Chances are what you see visually as opposed to the story they build around the imagery/video are the news items scripted to be talked about.

You can't ask such a question, because at some level 'news' you'll need to believe what you hear taken with a grain of salt, outside of experiencing what you expect to be reported on. Truth of the matter is, you can't trust every news source but you can digest the information you see and create your own opinion.

In some cases, I may read a news story, see a headline, or watch a video, but not necessarily believe the content they voice over. So I'll go ahead and research on my own more, purely based on the fact that I would rather hear the same story told by a few people to gauge my own opinion on it.

Honesty and accuracy are not the same thing. They may be honest in telling you what they believe is true but the fact that the information they provided may not have been accurate doesn't change the fact that they provided the information in good faith believing that it was true. This isn't only with the weather, this happens with normal news too.

If you're looking for a non biased news source then you'll never find it on stories other than those that merely report facts than you won't find it. Everything you do is affected by your biases even when you don't mean for it to, including news articles.